/Engine/Source/Runtime/OpenGLDrv/Public/OpenGLDrv.h
This will set most relevant pipeline state. Legacy APIs are expected to set corresponding disjoint state as well.
virtual void RHISetGraphicsPipelineState ( [FRHIGraphicsPipelineState](API\Runtime\RHI\FRHIGraphicsPipelineState) * GraphicsState, uint32 StencilRef, bool bApplyAdditionalState )